In 1934, the Washington Post called Elder Lightfoot Solomon Michaux, the “best known colored man in America.” He was known as the Happy-Am-I Preacher. His Sunday services were broadcast to over 25 million listeners on CBS radio. Black America saw Michaux as a leader for racial harmony and progress. But during the civil rights movement, his reputation took an unlikely turn.

This is episode 1 of our new miniseries Making Waves, three profiles of people who pushed the boundaries of radio. They used the microphone in different ways: one to warn, one to rile, one to preach. What they had in common is they were all controversial, they spoke to huge audiences in their time, and today, they’re largely forgotten.